dBm to dB Calculator

A question that is often asked is

How do I convert from dBm to dB?

The answer is you cannot convert between dBm and dB.

You can however add dBm and dB together using the calculator below. The answer is an absolute number in dBm.

Why can you not convert between dBm and dB?

dBm is an absolute number. For instance this calculator let’s you convert between Volt and dBm.

dB is a relative number and represents a ratio between two quantities. In communications engineering, dB is used to represent the signal-to-noise ratio, gain of an amplifier and more.

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